In September, John sold more soap than in February. In November, he

Solution:

• September’s sale is \(\frac{2}{3}\) more than sales of February, it makes sense to assume February’s sale to be multiple of \(3\) so that our calculation becomes easier.

• Let the sales of February be \(300\) units.

o Sale of September = \(300 + \frac{2}{3}*300 = 500\)
• Sales of November = \(500 + \frac{5}{100}*500 = 525\)
• Required percent = \(\frac{(525 – 300)}{300}*100 = \frac{225}{3} =75\%\)

• There are two increases after February, one in September and the second is in November.

o The first increase is of \(\frac{2}{3}\) part or we can say \(67\%\) approx.
o The second increase is \(5\%\).
• We can use the concept of successive percentage change to find an overall percentage change.

o \(67 + 5 + \frac{67*5}{100} = 72 + 3\) (Approx.) = \(75\%\)